[media] ec168: re-implement firmware loading

static int ec168_download_firmware(struct dvb_usb_device *d,

		const struct firmware *fw)

{

	int i, len, packets, remainder, ret;

	u16 addr = 0x0000; /* firmware start address */

	int ret, len, remaining;

	struct ec168_req req = {DOWNLOAD_FIRMWARE, 0, 0, 0, NULL};

	pr_debug("%s:\n", __func__);

	#define FW_PACKET_MAX_DATA  2048

	packets = fw->size / FW_PACKET_MAX_DATA;

	remainder = fw->size % FW_PACKET_MAX_DATA;

	len = FW_PACKET_MAX_DATA;

	for (i = 0; i <= packets; i++) {

		if (i == packets)  /* set size of the last packet */

			len = remainder;

	#define LEN_MAX 2048 /* max packet size */

	for (remaining = fw->size; remaining > 0; remaining -= LEN_MAX) {

		len = remaining;

		if (len > LEN_MAX)

			len = LEN_MAX;

		req.size = len;

		req.data = (u8 *)(fw->data + i * FW_PACKET_MAX_DATA);

		req.index = addr;

		addr += FW_PACKET_MAX_DATA;

		req.data = (u8 *) &fw->data[fw->size - remaining];

		req.index = fw->size - remaining;

		ret = ec168_ctrl_msg(d, &req);

		if (ret) {

			pr_err("%s: firmware download failed=%d packet=%d\n",

					KBUILD_MODNAME, ret, i);

			pr_err("%s: firmware download failed=%d\n",

					KBUILD_MODNAME, ret);

			goto error;

		}

	}

	req.size = 0;

	/* set "warm"? */